[Task]: Kafka connector expects a java class to be configured as serializer interface

[Bhashinee]

Description

While working on implementing some Kafka examples, I encountered that we need to configure a java class path as the serializer interface.

So for generic Kafka implementations need org.apache.kafka.common.serialization.StringSerializer class given as Key Serializer Class and Value Serializer Class.
For Avro messages, io.confluent.kafka.serializers.KafkaAvroSerializer should be given.

It is a nightmare for a user to know the values of these class paths. Better to have a dropdown list to choose from or improve the description. Rather than expecting the whole class path, we can just say StringSerializer or AvroSerializer to make it simple.

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